Thank you again!
I tried it on dummy dataset, it matches 1 row per unique id and skips
the other ones, please see below under 'nvp' column, any tips?
the command is
use testbaseline.dta
merge using testmaster.dta,_merge(_merge)
testbaseline: has baseline info about patients
testmaster: has the cohort data, different time points per patient
(i.e. different row for the same id number)
id nvp vl _merge
1 1 12000 3
1 123456 2
1 7481592 2
1 1234569 2
2 1 12122 3
2 654233 2
3 2 5435 3
3 789456 2
3 12587 2
4 2 35645457 3
4 963582 2
4 951623 2
5 3 3433 3
5 987456 2
5 123789 2
6 3 2344 3
6 963741 2
6 159789 2
7 1 23556 3
7 753951 2
7 874239 2
8 1 4577 3
8 9632178 2
8 741852 2
Thank you and best regards
ziad
On Sat, Mar 29, 2008 at 1:45 AM, Carlo Lazzaro <[email protected]> wrote:
>
> Dear Ziad,
>
> as Svend Juul pointed out in his yesterday's reply, -merge-may be a useful
> tool.
> Otherwise, provided you have not a different number of id between baseline
> and follow-up, files, you can try to copy and paste educ variable (but
> results are usually worse than with Svend's solution).
>
> Kind Regards,
>
> Carlo
>
> -----Messaggio originale-----
> Da: [email protected]
> [mailto:[email protected]] Per conto di Ziad El-Khatib
> Inviato: venerd� 28 marzo 2008 22.18
> A: [email protected]
> Oggetto: st: Adding variable from baseline file into cohort based file
>
> Dear STATA lister, it might be very simple question:
> Any tips how I can add a variable, called 'educ' from a baseline file
> 'baseline' into follow-up file (cohort based, where patients have been
> followed over 12 months time)?
>
> Thank you in advance and best regards
> ziad
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